Don’t try to force Elsie Platzer and Omar Shane Howard into neat boxes. The graduating Duval County seniors thrive on challenging people’s expectations and biases. Both recently earned full-ride Gates Millennium Scholarships to attend the colleges of their choice. Elsie Platzer, 17, a senior at Stanton College Preparatory School, plans to major in environmental sciences, she said, because most people are ignoring or denying climate change.